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Among the listed tests on bitumen binders, identify the test which cannot be used as a measure of the consistency of bituminous binder?

Among the listed tests on bitumen binders, identify the test which cannot be used as a measure of the consistency of bituminous binder? Correct Answer Flash and Fire point test

Explanation:

Softening point test:

  • Softening point denotes the temperature at which the bitumen attains a particular degree of softening under the specifications of the test.
  • The test is conducted by using the Ring and Ball apparatus.

Float test/penetration test/ furol viscosity test

  • Normally the consistency or stiffness of bituminous material can be measured either by penetration test or viscosity test.
  • But for a certain range of consistencies, these tests are not applicable and the Float test is used.

Solubility test:

The bitumen content of a bituminous material is measured by means of its solubility in carbon disulfide and hence can be considered as a purity test for bitumen.

Spot test:

A spot test is used to find out cracking in bitumen.

It is more sensitive than the Solubility test in terms of detection of cracking.

Flash Point: 

The flash point of a material is the lowest temperature at which the vapor of a substance momentarily takes fire in the form of a flash under the specified condition of the test.

Fire Point: 

The fire point is the lowest temperature at which the material gets ignited and burns under the specified condition of the test.

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